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noun - uncountable

software that is free to share with others and is - at least initially - free to use. The author requests (or requires) a "registration fee" to continue using the software, and perhaps enable additional functionality.

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noun

a bug that makes hardware or software unusable. For example, crashing on startup. "Showstopper" bugs certainly must be fixed before a product can be released, and often need to be fixed before development can proceed.

Interestingly, in its original theatrical use, a "showstopper" is something that's amazingly good.